Rear hub bearing for VAZ-2108: dimensions

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

The wheel bearing ensures uniform rotation of the wheel around its own axis. Of all the elements of the chassis of the car, it is the first to meet and distribute shock loads, so the main requirements for this part are strength and durability.

In this article we will talk about what is the rear hub bearing on the VAZ-2108. We will look at the design of this device, dimensions, and also deal with the process of replacing it.

Design Features

The G8 rear hubs are equipped with sealed ball angular contact bearings. Each of them has two rows of balls. This makes the structure as resistant to loads as possible, and also allows them to be distributed with the greatest efficiency.

The VAZ-2108 rear hub bearing is made of heavy-duty steel. Its resource, declared by the manufacturer, is 90-120 thousand kilometers. By the way, these are not empty statements. Oddly enough, but VAZ wheel bearings "run" for a very long time and, if used correctly, can last twice as long as the declared mileage.

Main characteristics and varieties

The rear hub bearing on the VAZ-2108 is produced under catalog number 256706. It has the following specifications:

• weight, g – 400;
• number of balls, pcs. – 28;
• ball diameter, mm – 9,525;
• static load capacity, KN – 25, 9;
• dynamic load capacity, KN – 30, 1;
• nominal speed, rpm – 6500.

The bearing number of the rear hub VAZ-2108 may be different. If the store offers you a product marked 537906 - do not be surprised. This is a heavy duty bearing. Some of its characteristics differ from those of the standard part:

• weight, g – 511;
• static load capacity, KN – 90, 1;
• dynamic load capacity, KN – 64, 8;
• nominal speed, rpm – 5000.

As you can see, the reinforced rear hub bearing on the VAZ-2108 has increased load resistance. But at the same time, its rotation frequency should not exceed 5 thousand rpm. Such products, with proper operation, can freely "walk" up to two hundred thousand kilometers.

Rear hub bearing VAZ-2108: dimensions

As for the size of the wheel bearing, for both modifications they are the same:

• outer diameter, mm – 60;
• inner diameter, mm – 30;
• width, mm – 37.

If you are offered a VAZ-2108 rear hub bearing, the dimensions of which do not correspond to those indicated, it is better to refuse this purchase. All of the above parameters are provided by GOST 520-2002. Foreign analogues of the spare part are manufactured in accordance with the requirements of ISO 15:1998 and have the same dimensions.

How to understand that it is time to change the wheel bearing

A failed rear hub bearing VAZ-2108 may declare its malfunction:

• appearance of a characteristic rumble from the side of the wheel;
• uneven wheel rotation;
• backlash formation.

Noticing that a rumble is heard from one or both rear wheels, hurry to diagnose the wheel bearings. You can do it right in your garage. Just jack up the rear wheel and turn it by hand. It should rotate easily and evenly without making any noise. Next, grab it with both hands and try to shake it from side to side in a horizontal direction. If the wheel rotates unevenly, and when it loosens, play is felt, get ready for repair.

Features of choice

When buying a rear hub bearing on a VAZ-2108, pay attention to the manufacturer. Currently, more or less high-quality domestic parts are produced by the following enterprises:

• SPZ (Saratov Bearing Plant);
• SPZ-4 (Samara);
• VBF (GPZ-23, Vologda);
• GPZ-20 (Kursk).

Reputed to be the bestthe domestic manufacturer of bearings is the Saratov plant. His products are very reliable, but not very expensive. So, the rear hub bearing on the VAZ-2108 produced by SPZ costs between 400-450 rubles.

VBF products are also highly reliable and cost slightly less. SPZ-4 and GPZ-20 bearings are designed for those who are used to saving on spare parts. Their cost is even less, but the quality leaves much to be desired.

There are also imported analogues on sale. They are, of course, expensive, but their quality is beyond doubt. For example, an SKF VAZ 2108 rear hub bearing made in Sweden costs about 900 rubles. The Japanese equivalent, NSK, will cost about the same.

What will be required from the tools

Before starting repairs, make sure you have the necessary tools and supplies:

• wheel chocks;
• jack;
• Wrench for wheel bolts;
• chisel (core);
• some object to fix the position of the car body when jacking up (a stump, a few bricks, etc.);
• hammer;
• spacer made of wood (bar);
• 30 socket with long handle;
• key on "7";
• vices;
• a piece of pipe for the outer diameter of the bearing;
• long nose pliers;
• special hub puller;
• special circlip pliers;
• liquid against rust.

If you decide to change the rear wheel bearing on the VAZ-2108, also replace the hub nut. At least that's what the manufacturer recommends. The fact is that the nut has a special edge that bends during installation and goes astray during disassembly.

Change the rear wheel bearing with your own hands

Replacing the bearing of the rear hub VAZ-2108 is carried out in the following order:

1. We install the car on a flat surface, fix the front wheels by placing wheel chocks under them.
2. Remove the cap covering the hub nut.
3. With a chisel (core) we bend the bent edge of the hub nut so that it does not interfere with its unscrewing.
4. Using the head on "30" with an elongated handle, unscrew the nut. If it does not lend itself, we process the threaded connection with a rust liquid.
5. After unscrewing the nut, unscrew (not completely) the wheel bolts.
6. Raise the body with a jack, fix its position with hemp (bricks), unscrew the wheel bolts. Dismantling the wheel.
7. Using the key on “7”, unscrew the guide bolts on the drum (2 pcs.).
8. Remove the drum. If it is not removed, we process the place where it is mounted on the protrusion of the hub with a rust-fighting liquid, and then knock it down with a hammer and a spacer made of wood.
9. Now completely unscrew the hub nut.
10. Using a special puller, dismantle the hub by grabbing it with "paws" and turning the nut. ATif you do not have such a device, take the removed wheel and screw it to the hub with the back side. Use the wheel as a lever.
11. Remove the hub from the trunnion.
12. Using long nose pliers or special pliers, remove the bearing circlip.
13. Put the hub on a vise and gently knock out the bearing with a hammer and a piece of pipe.
14. When the bearing is knocked out, lubricate the inner surface of the hub with grease.
15. Install a new bearing without removing the hub from the vise.
16. Place a wooden spacer on top of the bearing and, hitting it with a hammer, hammer the part into the hub until it stops.
17. Put the retaining ring in place.
18. We put the hub with a new bearing on the trunnion. If she sits tight, help her sit down with a hammer and a spacer.
19. We wind a new hub nut. We tighten it until it stops. The hub should still move inward.
20. Install the brake drum, fix it with guide bolts.
21. Mounting the wheel.
22. Remove the jack, tighten the hub nut completely. If there is a torque wrench, observe the tightening torque (186, 3-225, 6 Nm).
23. Bending the edge of the nut, fixing its position.
24. We put a cap on the nut.
25. Jack up the body, check how the wheel rotates and see if there is any play. It is also recommended to check the operation of the parking brake.

Some good advice

1. To keep the wheel bearing as long as possible, avoidrough road, do not brake directly on bumps or potholes.
2. Check the condition of the bearing at least once every three months.
3. If you notice signs of bearing failure on the road, don't worry. Even if it is out of order, you will still get to the house or the nearest service station. And nothing will happen to him.